I Designed this bird feeder to fit the bottle cap thread I usually have.
No Supports needed.
Bottle thread Ø 26.40 mm [1.04 in]
pitch 2 mm
[24.08.22 update]
I added a version with a different thread as asked by Buggi
that fits on some german bottle cap.
Also added thread pitch as a name suffix
The original thread was Ø 26.40 mm, pitch 2 mm [suffix p2]
The new thread is Ø 27.5 mm, pitch 3.18 mm [suffix p3]
feel free to ask for a different thread
I will be happy to prepare it,
if I get a chance and time to do it.
The author hasn't provided the model origin yet.